Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcdb4e588e691810…

MALICIOUS

PDF

74.9 KB Created: 2021-01-29 19:16:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 513686ab4348ade21fc63b89d208082a SHA-1: b58779a0ea4723af8434c1022e1df7a3391e896c SHA-256: dcdb4e588e6918107ff1791642a5b82323a1bcdd13a8ea43ad1a874263b49cba
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple embedded links to disposable hosting sites and a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/wb?keyword=man%20or%20vampire%20mod%20money In PDF document text
    • https://kujafuzepod.weebly.com/uploads/1/3/1/6/131637430/buloj-delapulogapan-luderi.pdfIn PDF document text
    • https://gevexivojuler.weebly.com/uploads/1/3/4/4/134444242/gemefabilopekadu.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/2323812.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388421/normal_5fca33177a67f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_5fc6647333841.pdfIn PDF document text
    • https://cdn.sqhk.co/rubekafux/JAjege1/two_player_games_at_home_date_night.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456393/normal_60109c800f986.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/kinezun-dajanidax-pitepugibusojeb.pdfIn PDF document text
    • https://cdn.sqhk.co/korokotuduki/eC2hdbr/37540352936.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sakaburepagase/60710467736.pdfIn PDF document text
    • https://s3.amazonaws.com/wizedumi/31722023256.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4E 4772 bytes
SHA-256: 1fee9794a61a3d86bc64556b0a724b9e25a1041fb63b3c77c869ce95a1d9fa38
font_01_sfnt_off0000ea6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6D 11300 bytes
SHA-256: bd70e17c99ff021270f3388edf9734c4b5b29fa4bb8f4fbc974b8e1d52643d06
font_02_sfnt_off000110ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110EA 4324 bytes
SHA-256: 781b9fae2fb9201b4a05d2041fea553bb2973f1d011ab9c51e3326c72e342c60

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